Lock



Patented June 11, 1929.

UNITEDISTATES PATENT oc-rr mum: ELLISON BEST, .01? SEATTLE, WASHINGTON, ASSIGNOR To'rRANK BEST, me,

or SEATTLE, WASHINGTON, :AUCORPORATION or WASHINGTON.

Application filed April 15, 1924. Serial No. 706,706.

My invention-relates tov improvements in looks for safe deposit box doors and. is in the nature of an nnprovementon the lock dis-.

closed by me in my prior application Serial No. 682,754, filed Dec. 26, 1923.

The object of my improvement is to pro vide a safe deposit box door having means for dead looking a bolt in a locked position incase a charge of explosive is introduced into or through the locks and exploded.

In safe deposit box doors sometimes only one, but usually two. locks are provided and are accessible from the outer side of the door. These locks are usually in the form of lock cores inserted into openings or recesses in the door. Unauthorized persons sometimes gain access to the safe deposit boxes on which these doors are placed by introducing explosive through the keyholes of the locks, exploding the same and blowing the lock cores out of the doors and then reaching into the lock core receptacles and retracting the bolt. The present invention makes it impossible to retract,v

the lock bolt after the lock cores are blow out 7 by providing means that will be operated by the force of the explosion dead locking the bolt.

Another object is to provide, on the lock bolt, means for preventing the latch mechanism from being released by the insertion of an instrument, if one look core is removed by other than forcible means.

In the accompanying drawings, which illustrate one preferred embodiment of the invention, Figure 1 is a view in longitudinal section, on a broken line 11 of Fig. 2 of a. safe deposit box door on which the invention is installed.

Fig. 2 is a view in cross section of the same substantially on broken line 22 of Fig.1.

Fig. 3 is a detached.perspective view of the lock bolt.

Like reference numerals designate like parts throughout the several views.

In the drawings I show a safe deposit box door 5 having on its inner side a thickened portion 6 provided at one end with a bolt receiving recess 7 and having two tubular bores 8 and 9 that extend from the bottom of the bolt receiving recess 7 rearwardly, the bore 8 being adaptedfor the reception of a bar 10 of material that is resistant to the flame of a cutting torch.

Operatively disposed within the bolt receiving recess 7 is abolt 11 having a shank 12 for permanently member 16 is use of his own .be engaged by'a flat springpawl 14. A1001; I 15 havin an eccentrically disposiedthrow provided for lifting thespring pawl 14 out of engagement with'theend of. shank 12 to permit the bolt to be retracted.

Another lock 17 is providedfor moving the bolt 11, saidlock 17 having an eccentric throw member 18 that operates in-v a transverse groove 19 in the shank 12.

In the ordinary operation of the locks the bolt 11 can only be retracted by the insertion of a. guards or custodians key in lock 15 and the insertion of a tenants key in lock 17.

The side of the shank 12 in which the groove 19 is formed is preferably flattened as more clearly shown in Fig. 3 and the shank 12 is provided near the rear end and on the flattened side with 'an integral segment 20 which fits snugly within the bore 9 and prevents any person from removing the lock core 17 and then reaching in with a wire or similar instrument, releasing the spring pawl 14 and retracting the bolt. This feature is important in a lock of this nature for the reason that the cores 15 and 17 are of the form that are adapted to be locked into the recesses in the door by key operated means as described in my prior patent No. 1,384,022 issued July 5, 1921, and, if an unobstructed passageway is left between the recess that contains core 17 and the rear end of passageway 9 the tenant who rents the safe deposit box will be able, by the key, to first remove the core 17 and to then insert a wire or similar instrument, lift the spring 14, retract bolt 11 and open the door without any assistance from the guard or custodian of the vaults.

To prevent retraction of the bolt 11 by any means after a charge of explosive has been exploded in any of the cavities of the door I provide a. recess 21 that extends rearwardly from the bolt receiving recess 7 andthat preferably intersects the receptacles in which the looks 15 and 17 are disposed and I provide retraction of said bolt. Obviously many other formsofmechanis'm may be used instead of the plug 22 for locking the bolt 11 against retraction in case of an explosion within the door.

It Will be understood that other changes in '7 the invention may be resorted to within the scope and spirit of the followings claims. I clalmz 1. In a safe deposit box door and lock of an instrument past the end of said'shank.

2. A vault door having a transverse lock recelvlng cavity and a bolt recess and another recess commnnlcating between said bolt recess and said lock receiving cavity, a lock in said cavity, a bolt in said bolt recess arranged to be operated by the lockand a blocking member in said communicating recess arranged to be displaced by an explosion in the lock receiving cavity and to block the retraction of said bolt. i

3. A safe cleposit'box door having lock receiving cavities and a bolt receiving recess all connected with each other by another recess, locks in said cavities, a bolt in said'recess controlled by said locks, and a plug normally immovable in said communicating recess and capable of being displaced by an explosion in said lock receiving cavities and caused to enter said bolt receiving recessbehind said bolt to thereby block retraction of said. bolt.

Seattle, Washington, April, 19:24.

FRANK ELLISON BEST. 

